Solution-Dose needs to be mixed in 50ml of d5w

A patient is to receive 2 million units of penicillin G potassium per day, every 6 hours in IV piggyback doses. The medication is available in vials of 1 million units/50mL, and each dose needs to be mixed in 50mL of D5W. How many mL will the nurse draw up for each IV piggyback does?

Please show each step and explain your answer.

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